There is a string of green and white lights strung around a mirror for every 6 green lights there are four white lights if there are 30 green lights how many white lights are there

There are 20 white lights.

Step-by-step explanation:

Given : There is a string of green and white lights strung around a mirror for every 6 green lights there are 4 white lights.

i.e. Ratio of green lights to white lights = 6:4

i.e.

Hence, there are 20 white lights.

answer: 25.4 units

step-by-step explanation: radius = 12.7 units

diameter = twice the radius

diameter = 12.7 x 2

= 25.4